Thanks in advance for your expertise. This sword was one that hung in the closet of my grandparents house and every year we went there I would ask to get it down and look at it. About 15 years ago after my grandfather passed away my grandmother one year simply gave it to me as a gift. It has been in my gun cabinet for years and I am trying to finally figure out the value and the quality of this sword. The story that I know is that my great uncle was in the navy and brought it home with him after the war. He died before I was born and no one seems to know anything about it.
Simple quick research that I did after looking at the markings on the tang look similar to one I found of Koa Isshin Mantetsu saku but not knowing any Japanese I'm curious to find out from the experts what the correct translation is.